I have once taken the whole of the NetBSD stack and implanted it in *gasp*
Linux. It's possible. You need to be extra-careful with interrupt handling
and somewhat careful with memory management, but otherwise it was not really
difficult.

Perry E. Metzger wrote:
>
>
>Taylor Anderson writes:
>> Hi all,
>> 
>> I'm working on an embedded computer, and I need to add TCP/IP
>> functionality.  How reasonable/unreasonalbe would it be to take
>> the networking code of NetBSD and implement it in another OS?  In other
>> words, are the kernel and networking portions of NetBSD inseparable?  
>
>It depends on what you think of as "reasonable". The 4.4 stack is
>good, but it isn't what I'd call "compact". Its also fairly strongly
>linked in to the kernel environment, though actually lots of it can be
>seperated out if you know what you are doing.
>
>Before contemplating this, I'd have a look at TCP/IP Illustrated Vol. 2.
>
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